I shoot loads of pistol FMJ - mostly WWB - at steels set about 10yds back. Just make sure the steel is hard enough not to crater, angle it down, and let it swing freely and you shouldn't have any problems.
Rifles are trickier - they probably make steel targets that would work, but it would have to be very hard and very thick, so it would probably be very expensive. Since I shoot a lot less rifle than I do pistol, I just set up wood or bottles.
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